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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26d2ca0594c75272dbde7d5c7998a800768951f27b132d39376ffa81a7579c7' 
  AND token = '/FUqjyU9erONL+OLtoP2NWdrDxvmjcyDdh0CucIvWAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}